/**
 * #      21
 * 名称   合并两个有序链表
 * 链接   https://leetcode-cn.com/problems/merge-two-sorted-lists
 * 题解   [2511](https://leetcode-cn.com/problems/merge-two-sorted-lists/solution)
 * 通过率 65.7%
 * 难道   简单
 */

